Tag: shackle ratings

New CM Shackle Markings and Pins Lead to Improved Operator Safety

New CM Shackle Markings and Pins Lead to Improved Operator Safety

Over the past few years, our forging operations in Chattanooga, Tennessee, have been working vigorously to improve product quality and deliveries. As you have seen with our In-Stock Guarantee, we remain committed to manufacturing the highest quality products in the market, stocking over 275 of our most popular chain and forged rigging attachment products and guaranteeing to ship them in 3 business days.

As part of this commitment to quality, we implemented some changes that resulted in even higher quality shackles. These changes include larger CM shackle markings and a new shackle pin design.

CM shackle markings

Enhanced Shackle Identification Markings

The forged identification markings on our CM shackles are now the largest and most user-friendly on the market.  The lettering has draft and rounded edges for use with synthetics. Some of the benefits of the larger and more legible lettering are:

CM shackle markings
Old Shackle Size
CM shackle markings
New Shackle Size

Improved operator safety by reducing the risk of users misreading or not being able to read important size and WLL information.

Reduction in replacement costs by decreasing necessary out-of-service issues due to worn and illegible identification.

Easier identification of the product as a CM shackle with a larger CM logo forged into the side.

CM shackle markings
Old Shackle Logo
CM shackle markings
New Shackle Logo

New Pins

We have also changed the shackle pins on our Screw Pin Anchor shackles (SPA) to provide more efficient thread fitting inside and outside of the shackle.

CM shackle marking
New High Strength Pin

Both the enhanced ID markings and the new pins are now on all shackles we ship today. We will continue to look for even more ways to improve the safety and durability of our shackles, to ensure we are providing the highest quality products to our customers.

This article was originally posted on June 13, 2013. Updates were made on April 6, 2017 to keep our information current.

Top 5 Reasons Why the CM Super Strong Shackle Rocks

Top 5 Reasons Why the CM Super Strong Shackle Rocks

CM Super Strong ShackleHistory has proven the American-Made CM Super Strong Shackle is one of the most popular shackles on the market. Here are the top 5 reasons I think that’s true:

1. It’s Super Strong
That’s an obvious one, right? But in many cases, by using the Super Strong Shackle, you can use a smaller size shackle while maintaining the required strength and ductility. Our Super Strong Shackles are carbon type shackles which average 17%-50% greater strength than a comparable shackle. As a result of this strength, these shackles have a 6:1 design factor.

2. A Wide Product Offering
We have a full range of sizes and finishes in our Super Strong Shackle product offering.  Below are two brochures available for you to download. Our  CM Shackle Technical Brochure highlights performance characteristics and test data, and our Super Strong Shackle brochure features our complete Super Strong Shackle product offering.

CM Super Strong Shackle
CM Shackle Technical Brochure

3. Proud to be Compliant with the “Buy American Act”
Our chain and rigging attachments are made in the great state of Tennessee, USA. In accordance with the Buy American Act, we can provide you a Certificate of Compliance at your request. Learn more about the Buy American Act.

4. Meets RRC-271 Specifications
The Super Strong Shackle has to be de-rated to meet the specification of RRC- 271. What does this mean? The Super Strong Shackle has the same dimension of the standard carbon shackle that meets RRC 271, however, it’s much stronger. For example, a 1” CM Super Strong Shackle has a WLL of 10 ton, but RRC 271 requirements are 8-1/2. Because they exceed the requirements and are marked with higher strengths, the Super Strong Shackles cannot be represented as meeting RRC 271.

5. It’s In-Stock. We Guarantee It!CM Super Strong Shackle
Columbus McKinnon is committed and prepared to ship our most popular chain and forged attachment products in 3 days – and we guarantee it! This is our In-Stock Guarantee (ISG). Currently, we offer more than 275 hoist, chain and rigging products that are guaranteed to be in stock and ready to ship.

Our In-Stock Guarantee features a number of popular Super Strong Shackles from 3/16” to 1.” Check out our In-Stock Guarantee video

Check out our recent blog article: “What makes our American made Super Strong Shackle super?”

Shackle Markings, Materials and Appropriate Standards

Shackle Markings, Materials and Appropriate Standards

shackle markingsS. H. from Georgia writes:

I am unfamiliar with the standards governing shackles and have a question regarding the stamped WLL on your shackles. Our company is using shackles with different ratings on them.  For example, we use a ½” shackle stamped a 2T WLL and a ½” shackle stamped with a 3T WLL.  I understand that there was a change in the standard several years ago and wonder if you could recommend which load rating is the correct one and what should be done with the shackles with incorrect stamping.  Also, neither shackle is stamped or marked as High Strength “HS” as required by the standard RR-C-271D and Amendment 1.  Any information that you can provide would be appreciated.

Peter Cooke, our Training Manager, answers this question on shackle markings:

Both of the WLL stamps on your two types of shackles may be correct.  Shackles fall under ASME B30.26 rigging hardware.  Shackle working load limits differ based on materials used to construct the shackle.  The industry has three types of materials for shackles: Carbon, Super Carbon and Alloy.  This means that you can have three shackles of all the same size (diameter) and have three very different working load limits.  ASME B30.26 requires the working load limit be stamped on all shackles.  A rigger must look for the WLL stamped on the shackle.

This is why you must never base your working load limit by diameter. If the WLL is no longer legible, the shackle should be discarded.

shackle markingsThe classification of a shackle as “High Strength” is based upon the classification of the shackle pin as HS. The HS stamp will be on the pin or bolt, not on the shackle.  All CMCO shackles – carbon, super carbon or alloy – have HS pins. So, you do not need to worry about mixing up pins between carbon, super carbon and alloy when using CMCO products.

See also Shackle Marking Reference File